pumps application+types+working

1. Pumps
APPLICATIONS, COMPONENTS, TYPES, WORKING,

2. What are pumps?
A pump is a device that moves fluid i.e. liquids or some time slurries by mechanical action.
Pumps can be classified in to three major groups according to the method they use to move the
fluid i.e. direct lift, displacement and gravity pumps.
HTTP://WWW.INDUSTRY.SIEMENS.COM/TOPICS/GLOBAL/EN/PUMPS

3. Applications or uses
Pumps are used in almost every home as a domestic water suction device for a daily life use.

4. Industrial applications
Building Services - pressure boosting, heating installations, fire protection sprinkler systems,
drainage, air conditioning
Industry and Water engineering - boiler feed applications, water supply (municipal, industrial),
wastewater management, irrigation, sprinkling, drainage and flood protection
The Chemical and Process Industries - paints, chemicals, hydrocarbons, pharmaceuticals,
cellulose, petro-chemicals, sugar refining, food and beverage production

5. What Is an industrial pump?
There are dozens of different industrial applications a several types of industrial pump designs to
fit the requirements.
Centrifugal pumps are used often in industrial applications. These pumps use a rotating impeller
to accelerate a fluid and increase its pressure. There are dozens of industrial centrifugal pumps
including slurry pumps, chopper pumps, sewage pumps, vertical turbine pumps, axial flow
pumps and more.
In addition, rotary and reciprocating positive displacement pumps are often used in industrial
applications to move fluids at steady flow rates with high pressure. Specifically, screw pumps,
progressive cavity pumps, lobe pumps, gear pumps, diaphragm pumps, and peristaltic pumps
are considered industrial PD pumps.

6. Components
Pump is made of two major components
1) motor
The power source of the pump which drives the shaft. AC motors and
DC motors are the most common power sources for pumps, but
internal combustion engines (ICEs), hydraulic power, and steam power
are other possibilities.
2) impeller
A rotating disk with a set of vanes coupled to a shaft. When
the impeller rotates, it imparts energy to the fluid to induce
flow. Flow characteristics of the pump vary widely based on
the impeller design.

7. Parts of a pump
Housing/casing – The outer shell of the pump which protects most of the components from the outside
elements. The casing of the pump should be of materials suitable to withstand the environmental conditions of
the application (e.g. submersible pumps should be water and rust corrosion resistant
Shaft – The shaft connects the impeller to the motor/engine that provides power for the pump.
Volute – The inner casing that contains the impeller and collects, discharges, and (sometimes) recirculates the
fluid being pumped. The materials used to construct the lining of the pump volute must be compatible with the
handled media.
Bearing assembly – The mechanical support that allows continuous rotation of the impeller and is continuously
lubricated.
Hub – Device attached to the bearing assembly which is the connecting point for the motor or engine.
Seal – Protects the bearing assembly from being contaminated by the pumped media. Some pump designs are
sealless, meaning the pumping mechanism is completely contained within a pressurized volute chamber with
static seals (e.g. gaskets or O-rings).

8. Additional components
Controllers – Used in conjunction with probes and sensors to provide operational information as well as
automatic or manual control of different pumping functions.
Fittings and adapters – Parts which connect different system components (pumps, motors, pipe, hose, etc.) to
one-another.
Mounting devices – Used to allow pumps to be mounted in different ways, such as on walls, on the ground, or
on/near associated stationary equipment.
Pump motor adapters – mounting devices used to connect dissimilar motor and pump bolt configurations.
Probes and sensors – Used to measure liquid level, pressure, temperature, and other important system factors
during system operation. Data from probes and sensors are sent to controllers or computers for system analysis
or response.
Valves – Used to control flow within different parts of the system, including the pump inlet and outlet.

9. Types of Impellers
There are basic three types of impellers which are used for different work conditions
1) closed type impeller:
open type impellers are used for clean water only. The impeller can clog if you pump solids or
"stringy material". It's difficult to clean out these solids from between the shrouds and vanes
2) semi closed type impeller:
these types of impellers are used for pumping liquid which may contain some small stringy
material.
3) open type impeller
the open type impellers are used for liquid which may contain some solid bodies .The open
impeller is less likely to clog with solids, but if it does, it is easy to clean.

10. Classification of pumps

11. Classification of pumps
Pumps are classified in two types
1) Negative displacement pump/centrifugal
2) positive displacement pump
Negative displacement pumps or centrifugal:
A pump that uses an impeller to move water or other fluids.
It produce a head and a flow by increasing the velocity of the
liquid through the machine with the help of a rotating vane impeller.

12. Types of negative displacement pump
Axial Propeller:
An axial propeller is a common type of pump that essentially consists of a propeller (an axial
impeller) in a pipe. The propeller can be driven directly by a sealed motor in the pipe or by
electric motor or petrol/diesel engines.
Fluid particles do not change their radial locations since the change in radius at the entry and
the exit of the pump is very small. Hence the name "axial" pump.

13. Mixed Flow Pump:
The Pump which moves fluid by both radial acceleration and lift and exits the impeller
somewhere between 0 and 90 degrees from the axial direction. As a consequence mixed-flow
pumps operate at higher pressures than axial-flow pumps.

14. Positive Displacement Pumps:
These positive displacement pumps have an expanding cavity on the suction side and a
decreasing cavity on the discharge side. The positive displacement pump operates by alternating
of filling a cavity and then displacing a given volume of liquid. The positive displacement pump
delivers a constant volume of liquid for each cycle against varying discharge pressure or head.

15. Types of positive displacement pump
Reciprocating pumps:
It moves fluid by reciprocating motion of piston. It is often used where a relatively small quantity
of liquid is to be handled and where delivery pressure is quite large. In reciprocating pumps, the
chamber in which the liquid is trapped, is a stationary cylinder that contains the piston

16. Rotary vane pump
A rotary vane pump is a positive-displacement pump that consists of vanes mounted to a rotor
that rotates inside of a cavity. As the rotor turns, fluid flows into the enlarging suction chamber
until it is sealed off by the vane. The enclosed fluid is then compressed until the outlet valve
opens against atmospheric pressure due to pressure difference fluid moves from higher to lower
pressure.

17. Positive VS Negative Displacement Pump
Flow Rate and Pressure Head:
The Centrifugal Pump has varying flow depending on the system pressure or head
The Positive Displacement Pump has more or less a constant flow regardless of the system
pressure or head. Positive Displacement pumps generally gives more pressure than Centrifugal
Pump's.
Capacity and Viscosity:
In the Centrifugal Pump the flow is reduced when the viscosity is increased
In the Positive Displacement Pump the flow is increased when viscosity is increased

18. Mechanical efficiency
Changing the system pressure or head has little or no effect on the flow rate in the Positive
Displacement Pump
Changing the system pressure or head has a dramatic effect on the flow rate in the Centrifugal
Pump

19. Principle of Operations:
Centrifugal Pump:
The impeller of such a pump is magnetically coupled with the motor, across a separation wall
which is resistant to the fluid pumped. The motor drives a rotor carrying one or several pairs of
permanent magnets, and these drag around a second pair of permanent magnets attached to
the pump impeller.
Positive Displacement Pump:
The fluid moved by the pump in one cycle (one suction stroke and one discharge stroke) as the
piston moves from its farthest left position to its farthest right position and then to farthest left
position.

20. Pump Efficiency:
Pump efficiency is defined as the ratio of the power imparted on the fluid by the pump in relation to
the power supplied to drive the pump. Its value is not fixed for a given pump.
Mathematically:
Pump efficiency = power output / power input
Pe= (Q × H) /(Pc × Me × Tl )
Where,
Q= Flow rate.
H= Head.
Pc= Power consumed.
Me= Motor efficiency.
Tl= Transmission loss.

21. Advantages And Disadvantages:
Advantage of Centrifugal Pumps:
As there is no drive seal so there is no leakage in pump.
There are very less frictional losses.
There in almost no noise.
Centrifugal pump have minimum wear with respect to others.
There is a gap between pump chamber and motor, so there is no heat transfer between them.
Because of the gap between pump chamber and motor, water cannot enter into motor

22. Disadvantage of Centrifugal Pump:
Because of the magnetic resistance there is some energy losses.
Unexpected heavy load may cause the coupling to slip.
ferrous particles in liquid are problematic when you are using magnetic drive. This is because
particle collect at impeller and cause the stoppage of pump after some time.

23. Advantages of Positive Displacement Pump:
In general, positive displacement pumps are ideal for applications where a constant flow is
needed.
They create medium to high pressure and are often an excellent way to pump oils and other
viscous fluids.
Positive displacement pumps are also extremely useful for applications requiring a combination
of low flow and high pressure. For example, to move fluids containing suspended or fragile
solids.

24. Disadvantages of Positive Displacement Pump:
Principally a source of pressure fluctuations, although
there are some that produce far less fluctuations than
others.
In general more gland problems.
Dynamic problems with check valves when applicable
In general higher maintenance costs.
Need for safety relieve valve to protect the piping
against exceeding the design pressure of the system.
Construction is in general more complex.
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